Should an emergency shut-off valve for the material inlet and outlet pipelines at the bottom of a liquid hydrocarbon storage tank be equipped with a handwheel?
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SHT3007 SH3136
The emergency shut-off valves for the material inlet and outlet pipelines at the bottom of liquid hydrocarbon storage tanks should be equipped with hand wheels. This is to allow for manual closure of the valve in emergency situations, in order to prevent potential safety accidents or environmental pollution. .
Are there any mandatory standards or documents?
If connecting to a SIS system or other instrument systems, regulations prohibit the installation of handwheels. Or could we add a manual valve as well? In this way, there will be no conflict.
Modern large-scale pneumatic on/off valves are designed to be usable both manually and pneumatically; in the event that pneumatic operation fails, they can be switched to manual operation.
Of course, there are relevant standards: IEC61508\IEC61511\ISAS84.01\SH/T3018. These standards specify that a SIS system is a safety system with a higher safety level than an ESD system, and human intervention is completely not permitted. It is the final protective system for an enterprise’s security devices. HG/T 20507-2014 Specifications for the Selection and Design of Automated Instruments 11.9.7 The control valves used for the safety interlocks in process production, which are intended for emergency shut-off, shall not be equipped with handwheel mechanisms. According to SH B-Z06-1999 Guidelines for the Design of Emergency Shutdown and Safety Interlock Systems in Petrochemical Industries, section 6.2.5, control valves related to safety shall not have a manual function (they should have a safety reset function).
Thank you, :handshake
Regulations have less legal force than official notices; don’t cling to regulations constantly – a single notice can invalidate them
This post was last edited by cust008 on 2023-4-12 at 10:30. First of all, the guidelines for screenshots state that it is required; otherwise, it violates the guidelines. Secondly, it is recommended to check the specifications for emergency shut-off valves. I recall that such valves are required to have three modes of operation: automatic, manual, and thermal; in addition, there are also requirements regarding the timing of activation. When checking the standards, it is also necessary to pay attention to whether there are any specific standards for emergency shut-off valves for liquid hydrocarbons.